Meleeing through walls wasn't intentional, I guess I just kinda assumed all walls were too thick for your attacks to reach through but never actually checked? (I did fix a bug where longer guns could shoot through walls since the bullets are created at the end of the barrel and that would poke through the walls if you were right next to them, that one was way too powerful; but since you wanna go fast for the bigger combos and slowly picking off enemies is... slow, I never found the melee wallhacks to be that gamebreaking)